We've just tagged Esri Leaflet Release Candidate 7. get it while its hot!
https://github.com/Esri/esri-leaflet/releases/tag/v1.0.0-rc.7
if you're busy with other things, you can also wait till later 
The Good:
We added better accessibility and now downgrade to a smaller Esri logo in apps in small maps
We made lots of improvements to the documentation
We gave L.esri.Layers.FeatureLayer a new method to delete records in bulk
lots more bug fixes and improvements!
The Bad:
If you are working with an older version of ArcGIS Server that is not CORS enabled, you now have to declare this explicitly. See this thread for more info. (That wasn't so bad, was it?)
The Ugly:
you were expecting there to be something ugly?? no way!!
Download links and a full list of bug fixes and enhancements can be found here:
https://github.com/Esri/esri-leaflet/releases/tag/v1.0.0-rc.7
cc/ GeoDev